At Lassen Volcanic National Park, the unique features and dramatic scenery are the results of the areas volcanic activity, both past and present. Sulphur Works is one such example in the park where evidence of the underground hydrothermal system rises through the cracks and displays its presence. In the same parking area as Sulphur Works is the trailhead for the very beautiful Ridge Lakes. One is a roadside attraction and one is a mere two mile hike roundtrip but both are worthwhile destinations!